Norwalk, OH has a population of 16,862 and is the 2,538th largest city in the United States. The population density is 1,902 per sq mi which is 639% higher than the Ohio average and 2000% higher than the national average. The median age in Norwalk is 39 which is approximately 1% lower than the Ohio average of 39. In Norwalk, 53% of the population over 15 years of age are married, 92% speak English and 6% speak Spanish. 81% of Norwalk residents were born in Ohio, 14% were born out of state, 1% were born outside of the United States and 4% were foreign born.